Calc the Clock is an Android application developed by REIRI that aims to help children practice their clock calculations. The app has two modes: Reading the Clock mode, which helps children read analog clocks, and Calculating the Clock mode, which helps children practice addition and subtraction questions related to clock calculations.

The app offers different levels of difficulty, and questions are randomized to keep children engaged. Correct answers are rewarded with smileys and badges, while incorrect answers result in badges being confiscated. The app also provides easy-to-understand feedback on correct and incorrect answers to help motivate children.

Calc the Clock is available for free and has been translated into approximately 40 languages, making it accessible to a wide range of children around the world. For more information on how to use the app and its various settings, parents or guardians can refer to the "About This Application" section in the menu.

Overall, Calc the Clock is a great educational app for children to practice their clock calculations in a fun and engaging way.